SU1738799A1 - Method for producing high-porous cellular glasscarbon- based material - Google Patents

Abstract

Usage: obtaining carbon materials, in particular the production of highly porous cellular material based on glassy carbon for high-temperature insulation, as well as filtering elements for molten salts, solutions of alkalis and acids. SUMMARY OF THE INVENTION: The method includes applying synthetic thermosetting resins to polyurethane foam and subsequent heat treatment of the obtained blanks in a furnace in three stages: polymerization at 150 ° C, carbonization in the temperature range 150-1000 ° C, high-temperature treatment at 2000-3000 ° ; C, placing the workpiece before heat treatment in a container with a lid made with double walls, the space between which is filled with dispersed powder to create a static atmosphere during carbonization. Moreover, the carbonization mode is as follows: in the temperature range 150- 550 ° C, heating is carried out at a rate of 100 ° C / h with an isothermal holding at 210 ° C for 40 minutes, at 350 ° C for 90 minutes, at 410 ° C. C 40 min., At 550 ° C 30 min. Further heating to 1000 ° C is carried out at a rate of 200 degrees / hour with isothermal exposure at 1000 ° C for 30 minutes. The yield of carbon residue during carbonization for 9 hours in a reducing gas medium is 67%, density 0.15OO, 01 g / cm3, strength (0.7-1.0) S, 1 MPa. 2 tab. fe

Description

The invention relates to the production of carbon materials, in particular to methods for the preparation of highly porous cellular material (CEPM) based on glass carbon, and can be used in the manufacture of high-temperature insulation, as well as filter elements for molten salts, alkaline solutions and acids.

The aim of the invention is to simplify the manufacturing technology of highly porous, cellular glass-based cellular material by reducing the duration of the carbonization process during

maintaining the quantitative yield of the final carbon product.

In general, the technological scheme for the production of glassy carbon based HPMPs is as follows: polyurethane foam (PU foam) is applied to a synthetic thermosetting resin, for example, phenol-formaldehyde resin (CFF), which is capable of carbonizing during heating. polymerization at 150 ° C, carbonization in the temperature range of 150-1000 ° C and

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high-temperature processing at 2000-3000 ° C. Moreover, the carbonization mode is as follows: in the temperature range 150-550 ° C, it is conducted at a rate of 100 degrees / h with isothermal exposure at 210 ° C for 40 minutes, at 350 ° C for 90 minutes, at 410 ° C for 40 minutes, at 550 ° C for 30 minutes, further heating to 1000 ° C is conducted at a rate of 200 degrees / hour with isothermal exposure at 1000 ° C for 30 minutes.

Data on the effect of the duration of the carbonization temperature ranges on the characteristics of the material obtained are presented in Table 1. The properties of the HPVM based on glassy carbon carbonized on the basis of the proposed and known methods are given in Table 2.

The results are shown in Table. 1 and 2 indicate the advantage of using as a protective atmosphere during the carbonization of a static atmosphere saturated with reducing gases formed during the destruction of the original components of glass-carbon-based HPAM, namely PUF and CFF.

The proposed method makes it possible to simplify the technology of manufacturing glassy carbon-based HPVMs by shortening the carbonization time by more than 10 times, as the most labor-intensive stage in the process of obtaining the HPCNM, but most important in the process of forming the carbon structure of the material.

Claims (1)

Invention Formula The method of obtaining highly porous cellular material based on glassy carbon, comprising applying to the polyurethane foam synthetic thermosetting resins and subsequent heat treatment of the obtained blanks in a furnace in three stages: polymerization at 150 ° C, carbonization in an inert atmosphere in the temperature range 150-1000 ° C, high-temperature processing at 2000 -3000 ° C, characterized in that, in order to simplify the technology of manufacturing highly porous cellular material based on glassy carbon by reducing the duration of the process bonding while maintaining the quantitative yield of the final carbon product, the billet before heat treatment is placed in a container with a lid made with double walls, the space between which is filled with dispersed powder to create a static atmosphere during carbonization, and the mode of carbonization is the following: heating in the temperature range 150- 550 ° C is conducted at a rate of 100 ° C / h with isothermal exposure at 210 ° C for 40 minutes at 350 ° C for 90 minutes, at 410 ° C for 40 minutes, at 550 ° C for 30 minutes, further heating to 1000 ° C is carried out at a speed of 200 degrees / h with isothermal aging at 1000 ° C 30 min. 0 five 0 0 Table 1 Table 2